78426500 has 48 divisors (see below), whose sum is σ = 173090736. Its totient is φ = 31040000.

The previous prime is 78426487. The next prime is 78426521. The reversal of 78426500 is 562487.

It can be written as a sum of positive squares in 8 ways, for example, as 20939776 + 57486724 = 4576^2 + 7582^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49724 + ... + 51276.

It is an arithmetic number, because the mean of its divisors is an integer number (3606057).

Almost surely, 2^78426500 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78426500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86545368).

78426500 is an abundant number, since it is smaller than the sum of its proper divisors (94664236).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78426500 is a wasteful number, since it uses less digits than its factorization.

78426500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1673 (or 1661 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 78426500 is about 8855.8737570044. The cubic root of 78426500 is about 428.0432090187.

Adding to 78426500 its reverse (562487), we get a palindrome (78988987).

The spelling of 78426500 in words is "seventy-eight million, four hundred twenty-six thousand, five hundred".